swift MapKit not showing annotation pins - ios

Question

I'm learning swift and trying to use SwiftyJson to parse a json file and add annotations in the map view but couldn't get the pins showed on the simulator. I have a warning in the debugging area says that Could not inset legal attribution from corner 4. My code is as below and I've checked some of the answers about this problem but still couldn't fix it. Any help is greatly appreciated.
class StationsViewController: UIViewController {
var stations = [Station]()
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self //as MKMapViewDelegate
//mapView.showsUserLocation = YES
fetchJsonData()
mapView.addAnnotations(stations)
}
func fetchJsonData() {
// Fetching client list.
let api_json_url = URL(string:"https://feeds.divvybikes.com/stations/stations.json")
// Create a URL request with the API address
let urlRequest = URLRequest(url: api_json_url!)
// Submit a request to get the JSON data
//let session = URLSession.shared
let task = URLSession.shared.dataTask(with: urlRequest) {data,response,error in
// if there is an error, print the error and do not continue
if error != nil {
print("Failed to parse")
return
}
// if there is no error, fetch the json formatted content
else{
let json = JSON(data:data!)
if let stationJSONs = json["stationBeanList"].array {
for stationJSON in stationJSONs {
if let station = Station.from(json: stationJSON) {
self.stations.append(station)
}
}
}
}// end if
} // end getDataSession
task.resume()
} // end readJsonData function
}

Answer 1

for stationJSON in stationJSONs {
if let station = Station.from(json: stationJSON) {
self.stations.append(station)
let latitude = station["latitude"]
let longitude = station["longitude"]
let annotation = MKPointAnnotation()
let centerCoordinate = CLLocationCoordinate2D(latitude: latitude, longitude)
annotation.coordinate = centerCoordinate
annotation.title = "Pass Title here"
mapView.addAnnotation(annotation)
}
}
check this.

Answer 2

You need to call addAnnotation in fetchJsonData(), because fetchJsonData() is executed asynchronously.
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self //as MKMapViewDelegate
//mapView.showsUserLocation = YES
fetchJsonData()
}
func fetchJsonData() {
// Fetching client list.
let api_json_url = URL(string:"https://feeds.divvybikes.com/stations/stations.json")
// Create a URL request with the API address
let urlRequest = URLRequest(url: api_json_url!)
// Submit a request to get the JSON data
//let session = URLSession.shared
let task = URLSession.shared.dataTask(with: urlRequest) {data,response,error in
// if there is an error, print the error and do not continue
if error != nil {
print("Failed to parse")
return
}
// if there is no error, fetch the json formatted content
else{
let json = JSON(data:data!)
if let stationJSONs = json["stationBeanList"].array {
for stationJSON in stationJSONs {
if let station = Station.from(json: stationJSON) {
self.stations.append(station)
mapView.addAnnotation(station)
}
}
}
}// end if
} // end getDataSession
task.resume()
} // end readJsonData function